Screen separator



A.1.11m 28, 1930. J. F. ISBELL SCREEN SEPARATOR Filed June 19. 1922 2 Snee1s-sneet 1 Jan. 28, 1930. J. F. lsB'ELl. 1,744,899

SCREEN SEPARATOR Filed June 19. 1922 2 Sheets-Sheet '2 jg [96 9710/ 4/15 +4 4957) L8 8'5 86 [J9 v 76 Y (971 separators for separating srras PATENT ori-"1c JOI-IN F.` ISBELL, OF ALHAMBRA, CALIFORNIA; CLEMNTINE ISBELL, ADMINISTRA- TRIX OF SAID JOHN F. ISBELL, DECEASED', ASSIGNOR OF ONE-HALF TO OTTO Q. BECKVIITH, OF LOS ANGELES, CALIFORNIA SCREEN snrARATon Application filed .Tune 19,

My invention relates to inclined screen and sizing sand, gravel, crushed rock, ores, and similar materials; and particularly embraces new and improved means for vibrating the screen; which greatly increases, its capacity; pro,- duces highly satisfactory results; and renders it adaptable to either wetor dry screening of an almost iniinite variety of Vmaterials of all sizes. n' p v.

The vibrating mechanism Yis rofV an oscillatory typederiving its reciprocatory motion from an unbalanced pulley-which de? livers a series of quick, sharp impacts, of high frequency, to the screen; so that its vibratory motion is at right angles tothe plane of its surface. While the mechanism is mounted to deliverits impacts on but one side of the screen, its arrangement and operation are such that theimpacts are in. thenature of blows delivered alternately against the screen from opposite sides; so that, inv effect, one blow instantaneously removes the screen from supporting the material and the next successive b-low forces it upwardly against it, with` such rapidity and intensity that thefines orV undersized materials'ar'e quickly disposed of. Impacts of this character practically elimi-^ nate possibility of the screen becoming clogged by small particles of material lodging inthe meshes, which adds greatly to its efficiency and capacity. Itis in the delivery of this series of ultra-rapid, ysharp andV disj l f tinct impacts, without deleterious eifect upon the mechanism,y that the principal success 'of my invention lies.

A characteristicand highly important accomplishment of my invention is the deliver ing of four distinct vib'ratory impacts to the screen cn each revolution of the unbalanced pulley; so that they screen may be vibrated at a high frequency' ratewitha comparatively low beltspeed and It. l). M. of the unbalanced pulley'. rllhis greatly minimizes wearand tear on tlie mechanism; Vand also permits a wide range of adjustment of the intensity of screen vibrations with a correspondingly slight increase or decrease in the R. P. M.-of the unbalanced pulley.

A further feature of the invention is the 1922. Serial No. 569,495.

large number of adjustments which may be made to alter the vibratory motion of the screen, from a series'of quick, sharp vibra-v tions of high frequency and small amplitude, to a series of heavier vibrations of less free quency, and comparatively large amplitude; and to vary the force of the'vibratory impacts. p This iexibility renders the mechanism capable of handling a large variety of materials of various sizes, which is highly desirable in the art.

- Furthermore, the mechanism is simple in operation; inexpensive to manufacture; and sufficiently strong and durable, with so few wearing parts, that its cost of maintenance will be negligible.

The accompanying drawings illustrate the preferred specific embodiment of my invention, in which- Fig. l is a side elevation of my invention; Fig. 2 is aplan view thereof; Fig. 3 is a lon gitudinal verticaly section, taken as indicated by theV line 3 3 of Fig. 2; Fig. 4 is a transverse vert-ical section, taken as indicated by the line 4-4 on Figs. 2 and 8; Fig. 5 is an enlargedfragmentary sectional view taken as indicated by the line 5*-5 of Figs. 1,2 and 3; Fim y6 is an enlarged fragmentary sectional view taken as indicated by the line 6 6 of Fig. '2; Fig. 7 is an enlarged side elevation of the unbalanced pulley; and Fig. 8 is a transverse vertical section taken through this f pulley as indicated by the line 8-8 ofFig. 7.

- In the' drawings, referring first to Fig. 1,. the numeral 10 designates generally a main frame, supported in any inclined positionin any suitable manner, as upon corner posts 11 and cross braces 12. It may beset at any desired degreefofV inclination, say betweenl ten and forty-five degrees, depending upon the' 9 character and quantity of material being handled. A distributor or feed chute 13 is supported at the upper side of the frame l0, in any suitable manner; and may be equipped with any of the well known means for effect-y ing an equa-l distribution of the material across the upper edge of the screen. A discharge chute 14 is provided across the lower edge ofthe frame 10, into .which the tailings or oversized materials from the screen deposit,

from whence they may then gravitate into a suitable receptacle 15. A discharge chute 16, into which the fines or under-sized materials are deposited through the screen, extends across substantially the entire bottom area of the frame; and the. fines may gravitate from the chute 16 into a suitable receptacle, as designated by the numeral 17. The foregoing arrangement is for a single separator or unit g however, any number of units may be mounted one above the other in a sia-Zag arrangement for successively screening or separating the finer materials; the oversized materials being discharged from the screens through the chutes 14, and the undersized materials discharged onto the next lower units, through the chutes 16. Or they may be placed end to end in echelon, so that the oversized materials will be discharged, as through chutes 14, onto the next lower screen, while the undersized materials or fines may be taken oit and discharged into suitable receptacles, as through the chutes 16.

The main frame consists of parallel side members, and parallel top and bottom transverse members; the latter preferably being mounted, relative to the former, so they will extend in a vertical plane when the members 18 are mounted in an inclined position. as shown in Fig. 1.

A pair of tubular supporting members 20, upon which the screen and actuating mechanism are moumed, extend transversely across the frame 10; being removably supported in suitable bearing blocks 21 and 22; the latter secured on the top edges of the frame members 18, as by means of bolts or lag-scrmvs The blocks 21 are simple bearing blocls in which the upper supporting member is revolubly mounted; cap screws 24 being4 provided in their tops to hold this supportingr member against rotation therein. The lower bearing blocks 22 are in the nature of pillow blocks. having removable top portioi'zs secured by cap screws 25; so tl e screen and its vibrating mechanism may be raised from the position shown in solid lines in Fig. 1 to that shown in dotted lines. with the upper supporting member 2() serving as a fulcrum. This is for the purpose of enabling the re-V placement or repair of screens, which will be more fully hereinafter explained. lVhen the screen and operating mechanism are raised, as ust described, the cap screws 24 are loosened to permit rotation of the member 20 in the bearing blocks 2l. It may be here noted that the cap screws 24, and similar screws 26, in the tops 22a of blocks 22, also serve to hold the supporting members 2O against axial movement.

The vibrating mechanism-generally designated by the numeral 27-is carried upon a pair of frame members 2S, which. in turn, are supported upon the tubular supporting members 20. The frame members 28 are identical, each consisting of a base or supporting member 29 and a standard 30, which may be formed either integral or separable as desired; being shown here as formed integral. The base members 29 are T-shaped in cross sectional configuration, to provide for lightness and strength of construction, and are carried directly upon the supporting members 20. They are connected at each end to the members 20 by means of integral tubular split bearings 31, through which the members 20 extend; being clamped thereon by means of bolts 32 extending through suitably formed integral lugs 33. In this manner the frame members 28 are mounted axially adjustable upon the members 20.

The standards supported upon the base members 29, extend upwardly in parallel planes, and consist each of a pair of legs 30, of substantially the configuration shown in the drawings being joined intermediate their ends by an integral transverse brace member 34, and at their tops by removable caps secured thereto by means of cap screws 3G. Bearing blocks 37 are mounted to slide vertically between the contiguous faces of the legs 30, intermediate the transverse braces 34 and the removable caps 35. The blocks 37 have channels out in their vertical edges, (see Figs. 3 and 4) to form flanges for engaging the opposite edges of the faces 30", so they may be moved vertically but held against transverse movement: the faces 30b being parallel intermediate the transverse braces 34 and the removable caps 35, and finished. for this purpose. Blocks 37 are made vertically adjustable by means of screws 38, extending loosely through bores 39 in the caps 35 4) and screw-threadedly engaging bores 40 in the blocks. Lock nuts 41 are provided for rigidly holding the screws and blocks in adjusted position.

A transverse shaft 42 is revolubly journaled in suitable bearings in the bearing blocks 37; and carries a belt pulley 43 rigidly secured thereon, intermediate the juxtaposed standards 30; spacer blocks 44 being likewise rigidly mounted upon the sha tt 42, intermedi atc the bearing blocks 37 and pulley 43, to hold the shaft against axial movement. A belt pulley 45 is likewise rigidly mounted upon the shaft 42, adjacent the outer face of one of the standards 30: and another pulley 46 may also be provided on the outer end of the shaft, to rotate loosely thereon, to which a belt 47 may be shifted. when the vibrator mechanism is to be put out of operation. The belt 47 will be shifted to the pulley 45, to drive the shaft 42 and operate the vibrator mechanism, in the member to be hereinafter described. The belt 47 may be driven from any suitable source of motive power (not shown).

of g,

v A rocker arm, generally designated by the numeral 48--hereinafter called the vibrator beam-1s rigidly clamped upon a roclr shaft 49 by means of a central split bearingr 50 and the rock shaft 49 is, in turn, journaled at each end in suitable bearings 51, yformed integral With the base members 29 of the frame members 28. The split bearing 50 is of sufficient length to extend bet-Ween and abut against the base members 29, to/prevent axial movement of the shaft, and also any transverse movement of the vibrator beam relative to the frame members 28. The vibrator beam 48 consists ofV a pair of coplanar arms 52, extendingoutwardly from opposite v the vibrator beam its oscillatory motion. The

pulley 54 is thus situated directly beneath and in alignment with the pulley 43 and is operatively connected therewith by means of a suitable drive belt 54-A- The pulley 54, illustrated in Figs. 7 and 8, is preferably of the configuration shown, consisting of a hub 57 and a rim or belt surface 58 connected by a central Web 59. It is unbalanced by means of eccentric Weights 60, removably secured intermediate the hub 57 and rim V58, on either side of the web 59, by means of a'bolt 61, extending through the Weights and web, as shown in Fig. 8. The Weights 60 Will preferably be segmental in form, as shown, and as will be later explained they may be provided in different sizes, to adjustably alter the force of vibratory impacts delivered to the screen.

rlhe arms 52, of the vibrator beam 48, terminate at their outer ends in tubular hammers 62; having bores 63, the axes of which extend at substantially right angles to the plane of the arms A pair of bridge Y members 64, which also serve as braces, ex-

tend transversely between the base members 29, intermediate the bearing 5() and the outer ends of the arms 52, as clearly shown in Figs. 3 and 5. These members rest upon the top faces of the members 29, above the arms'52,

and have downwardly depending ears 65 coin- Y ciding With lugs 66 upon the members 29,

through Which bolts 67 extend to hold them rigidly in place. Y

A. means for adjustab-ly cushioning the oscillatory force of the arms 52 is provided in the form of studs 68, rigidly mounted upon the arms 52 and extending loosely through apertures 69 in the bridge members 64. Helical springs 70 surround the studs, 68 and are conlined between the topjfaces of theA bridges 64 and disks 71, secured ontheir upf per ends by means of nuts 72. Annular flanges 73 may be formed on the top faces of the bridges :64 to'hold the springs 70 against lateral movement.

AThe details of construct-ion, andthe manner of mounting the screen-herein generally designated by the numeral 75upon the frame 10,*forms the subject-matter of a. copending application for patent, filed on the 19th day 'of June, 1922, Serial No. 569,496; but in orderthat its function, in combination With the vibrating mechanism, may be herein clearly understood, l will describe in a general Way its construction and operation in so far as itco-operatively functions with the vibrating mechanism hereinbefore described. rlhe screen fabric 76 is carried upon and between a pair ofside rails 7 7, extending parallel with and between the side members 18 of the frame 10. The members 77 are, in turn, suspended rfrom the supporting members 20 by means of hangers 78 rigidly connectedr to them and hingedly connected at their upper ends-as i at 79-to the .y outer ends of spring bars 80. Both the hangers 78 and the bars 8O are preferably constructed of flat metal, the bars 8O being constructed of spring steel to permit a limited amount of movement of the screen in a direction perpendicular to its surface. The hangers 78, by reason of their hinged connection with the bars 80, will permit a limited amount of lateral swinging movement of the screen in a plane parallel to its surface. The bars 80 are secured to the supporting members 20 by means of clamps 81, which are axially adjustable on the members 20 to'vary the points of support of the bars '8O relative to their outer ends. ln this manner the portions of the bars 80, intermediate he clamps 81 and the hinged ends 7 9, may be lengthened or shortened, thereby increasing or decreasing the extent of yielding vertical movement permitted the side rails 77. Thisfmeans of yieldingly supporting the screen 75 renders it more sensitive and susceptible, throughout its entire surface, to the vibratory impacts of the vibrator beam.

The rails 77 are held in spaced relation by means of transverse V'brace members 82. The screen 7 6 is secured to the rails 77, and is supported along its upper and lower edges upon reinforcing members 88, which may be con structed of angle-iron of suitable size. this instance the screen 76 is secured to the angle iron 83v b'vmeans of bolts v84, having round heads protruding above the screen so as present `the least possible obstruction to .materialtpassing over them, A resilient vbar 85 of flat met-al is secured at each'end to the reinforcing bolts 86, and'extends beneath the screen from its top to bottomedejes, directly beneath and alignin t with .the vibrator beam 48; this bar also supporting the longitudinal center@y members 88. by means of suitable screen 76 across itsV les A pair of studs S7, having heads 87, extend upwardly through the bar 85 and screen 7 5; being retained therein by means of lock nuts 8S. The lock nuts 9S, together with washers 89, also serve to hold the screen 76 against they bar 85, as clearly illustrated in Figs. 3 and 6. The upper screw-threaded ends ot' the studs 87 engage in internally screw-threaded bores 9() in tubulz r adjusting members 91. The studs 87 carrying the adjusting sleeves 91 are situated directly beneath and in axial alignment with bores 01"' the hannner ends G2 ot the vibrator beam 4S; and studs or cap screws 92, havingl heads 93 and lower screw-threaded ends 94, extend loosely through the bores 63 in the hammer ends 62 and screw-threadedly engage the upper internally7 screw-threaded ends of the bores 99 in sleeves 91. The sleeves 91 are split on opposite sides of their ojposite ends, as illustrated in Fig. G, and bolts 95 extend through suitably forn'ied lugs to clamp these opposite ends in adjusted positions upon the studs S7 and 92. lilith the foregoing described means the extent of oscillatory motion of 'the viluator beam 4S may be limited by adjusting the impact surfaces 9G am,1 97, upon the under Yfaces of the heads 93 of studs 92 and the top ends ot the sleeves 91, respectively, relative to the impact surfaces 98 and 99 upon opposite ends ot the hammer ends 62 ot' vibrator beam 4S, by tirs-t. vertically adjusting the sleeves 91 upon studs 87 and then by vertically adjusting studs 92 in the upper ends ot sleeves 91. r hismay be easily accomplished by loosmiing the clamp bolts 95 and releasing the clamping etliect o the split ends or sleeves 91 and then screw threadedly adjusting the studs 87 and in the internally screw threaded bores 90. It may be here noted that the ogpiposite ends ot' the bores 90 are provided with right-hand threads, or they may be provided with right and left-hand threads 'tor effecting this adjustment. In any event, it essential that the spaces between the surte' s 96 and 9S and 99 and 97,` upon the hammers 62, studs 92 and sleeves 91, he ot equal length when the vibrator beam is in its normal central besition; or at least that these spaces be equal at both ends ot' the arms 52. The :foregoing construction is preferable, however, it is ohvious that other forms may be utilized, as it is only necessary to provide means whereby the arms 52 will deliver vibratory impacts to the screen upon their up and down movements, and in opposite directions upon ditferent portions of the screen.

In operation the screen and vibrator mechanism are in the position. relative to the frame 10, as illustrated in solid lines in Fig. 1, and as shown in Figs. 2, 3 and 4. Power is transmitted to the pulley 45 upon the sha tt '42, through the medium of the drive belt 47 (from any suitable source of motive power). The belt pulley 43 being xed on the shaft 42 rotates the unbalanced pulley 54, through the medium of belt .E4-A. The pulley 54, being unbalanced by the attachment of the weights 60, eccentric to its center, and being rotated at a high rate of speed, will cause an oscillatory motion to be transmitted to the vibrator beam 4S, as indicated by the arrows in Fig. 3, reciprocatively rocking this whole member upon the shaft 49. This reciprocative or oscillatory motion transmitted to the vibrator beam 48, by rotation of the unbalanced pulley 54, will cause a vertical oscillatory motion, in opposite directions, of the outer ends ot the vibrator beam or arms 52, causing the faces 98 and 99 ot the hammers ('32, to very rapidly successively impact against the faces 9G and 97 of the studs J2 and adjustment sleeves 91, thereby transmitting rapid vibratory impacts to the screen 76 'through the medium of the studs 87 mounted on the bar 85. The vibrations thus transmitted to the screen are very sharp and clear cut, causing the screen to vibrate at a very rapid rate. The screen 76 will be drawn very tight and this will, to some extent atfect the sharpness of the vibrations. It is to be noted that the adjustment of the sleeves 91 and the studs relative to the ends 62 of arms will determine the limit of the oscillatory motion ot' the vibrator beam 48.

Wlhen the vibrator mechanism is set in motion the material to be separated is fed to the screen through the distributor 13 which may be of any suitable type to properly distribute the material across the top edge of the screen; and the vibration ofthe screen will cause the undersized materials or fines to pass through the meshes while the oversized or tailings will gravitate downwardly over the surta c ot the screen and be discharged over the chute 14 into any suitable receptacle, as shown at 15; the undersized material or tines being caught in the chute 16 and deposited in a suitable receptacle 17.

lith the present vibrator mechanism the vibrations of the screen are at right angles 'to the plane ot its surface, and being clear cut and sharp, cloggingr of the meshes oi thc screen is practically eliminated. This prevention of clogging ot the meshes of the screen is also g1 atly minimized due to the fact that my vibratfgir mechanism not only delivers an impact to one side ot the screen, as, for instance, to more it downwardly away from supporting the material, but it also delivers the equivalent oi an impact to the opposite side of the screen which immediately and successively throws it upwardly against the material falling to 'ards it. which adds greatly to the capacity of the screen. These successive impacts delivered as from opposite sides of the screen are also of material importance in increasing its capacity when handling wet material. It also to be noted that with my device I not only obtain four times the number of vibrationsy ordinarily obtained from an impact arm operating at the same speed, but that I also `at'the same time deliver impacts to the screen as from opposite sides, by the surface 98 engaging the face 96 on stud 92, on one oi the arms 52, while the face 99 impacts with the face 97 on sleeve 91 on the opposite arm 52.

A. number of adjustments may be made in my mechanism to adapt it to the handling of almost any type of material and for screening through many dierent sized meshes ofV 2 balanced pulley 54 is driven; second, by altering the tension of the drive belt 5ft-A between the pulleys 43 and 54; third, by changing the-weights 60 upon the unbalanced pullev54; fourth, by adjusting the compression of springs and iif'th, by adjusting' sleeve 91 and studs 92 relative to the ends 62 of arms 52.

The speed of the drive belt'47, of course, may be altered in any suitable way, common to the increase or decrease of speed of such belts. The tension of the drive belt 5%A is altered by vertically adjusting` the bearing f blocks 37 upon the standards 30, relative to the unabalanced pulley 54, through the medium of the screws 88. Tightening this belt will of course cushion and limit to a certain extent, the oscillatory motion of arms 52 and 53 and unbalanced pulley 54, (in the direction indicated'by the arrows in Fig. This adjustment has more of a cushioning effect upon the vibrator beam 48 than anything else.

AThe extentto which the pulley 54 is unbalanced may be altered by changing the Weights 69 upon it, either increasing or decreasing their size and weight, which willalter the extent to which rotation of this pulleyA will transmit oscillatory motion to the arms 53 and vibrator beam 48 and will alter the force of its impacts in proportion to the extent 0i' their movements. The adjustment of conipression of springs 70 is effected through the medium of the nuts 72 upon the upper end of the studs 68; and this 'adjustment also hasa tendency to produce a cushioning effect upon the oscillatory motion of the vibrator beam 48; but principally their function is to balance up the impacting force of the arms 52 and compensate for slight inequalities in adjustments of studs 87 and 97 and sleeves 91. Both the springs 70 and tension of belt 56,

will have this'cushioning effect and will more or less'limit the 'degree of force with ,which the hammer ends 62,' upon the arms 52, `will impact against the sleeves'91 andheads 93 of studs 92. The extent of oscillatory motion of the vibrator beam 48 is, of course, adjusted through th-e medium of sleeves 91 and studs 92, relative to the hammers 62, as yhereinbefore described. It is obvious that any of these adjustments may be made individually to effect the vibratory motion of the screen 76, or they may all be made so as to have their cumulative effects to adapt the screen to materials of different sizes and character;

Thus regulation of thespeed of rotation of the unbalanced pulley will regulate the number of yvibratory` impacts' delivered to .the screenper minute; while regulation ofthe distance vof throwr of the arms 52, With or withoutl alteration of the Weights upon the unbalanced pulley, Willalter the force of the impacts.- vChanging of the weights 'upon the unbalanced pulley may also alter the force of n l the impacts' without altering the distance .of throw of the arms 52, and Without altering the vibratoryif'requency of the impacts.

The screen `7 5 being yieldingly suspended v,

and the vibrations transmitted to itthrough the vibrating mechanism 27 as hereinbefore described, the Vvibrations will beftransmitted throughout the entire surface of the screen 'so that the material adjacent'the side rails 77 Vwill be just as efliciently screened and hani dled as that' at the center of the screen. This f:

yielding suspensionv is due to the resilient or of the screen. A y

Owing to my particular manner of producing the oscillatory motion of the vibrator" beam 48, and the fact that these motions are only'limitedby the impact surfaces on the hammers 62 engaging the impact surfaces on.

the sleeves 91 and studs 92, excessive wear and tear upon and racking of the mechanism is avoided. The impacts of the hammers with the sleeves 91 and studs 92fare the only positive and fixed stops to the motion of the vibrator beam; all the other means being cushioning y stops to fits movements. This produces anextremely durable mechanism, and conduces to low cost of maintenance.

While I have shown and described a prey units, comprising the frame members 28, with the drive pulleys and vibrator beam mounted thereon, may be mounted upon supports 20, to

transmit vibrations to a single screen. This may be Vdone merely by adjustably mounting these mechanisms'at the desired points over the screen upon the supports 20. In this manner one large screen may be vibrated by a number of vibratory units, avoiding the necessity of constructing a number of small screens. Also, While I have merely shown one screen 7 6, it is obvious that I may use several superposed screens, as in the case ot' scalper screens with successively liner screens beneath them, so that a number of grades of material may be separated in a single device.

Furthermore, the vibrating mechanism need not, in all cases have direct connection with the screen, as its vibratory impacts may, for some uses, be transmitted to the screen frame or other support; or it may be used in connection with a device for separating materials, such as a concentrator table, where no screen is used. Also, in its broader aspects, the invention need not be limited to a vibratory beam pivoted at its center, as this element may be in the form of a bell crank having only one arm By this means, the prilnary principle of my invention, including the feature of the transmission of the vibrator impacts to the screen, transversely to its screen surface and alternately in opposite directions, may be eectively carried out.

I claim:

l. In a device for separating materials, the combination of a suspended screen, and means to vibrate said screen by delivering vibratory impacts to the suspended portion of the screen, alternately in opposite directions, transverse to the plane of its surface.

2. In a device for separating materials, the combination of a suspended screen, means to vibrate said screen by delivering vibratory impacts to the suspended portion of the screen, alternately in opposite directions, transverse to the plane otl its surface, and means to yieldingly support said screen, said means being yielding in the direction of the force of the vibratory impacts.

3. In a device for separating materials, the combination of a suspended screen, means to vibrate said screen, said means comprising a rocker arm adapted to deliver vibratory impacts to the suspended portion of the screen, alternately in opposite directions, transverse to the plane of its surface.

4. In a device for separating materials, the combination of a suspended screen, means to vibrate said screen, said means comprising a rocker arm adapted to deliver vibratory im pacts to the suspended portion of the screen, alternately in opposite directions, transverse to the plane of its surface, means to yieldingly support said screen, said means being yielding in the direction of force of the vibratory impacts, and means to vary the extent of its `yielding movement.

5. In a device for separating materials, the combination of a screen secured around its marginal edges to a supporting frame, and

means to vibrate said screen, said means comprising a rocker arm adapted to deliver vibratory impacts to the central unsupported area of the screen, alternately in opposite directions trans-:arse to the plane or' its surface, and means to oscillate said rocker arm.

(i. In a device for separating materials, the combination of a screen, means to vibrate said screen, said means comprising a rocker arm adapted to deliver vibratory impacts to the screen, alternately in opposite directions transverse to the plane of its surface, an unbalanced pulley carried by said rocker arm to oscillate it, a drive pulley mounted adjacent the unbalanced pulley, a belt connection between said pulleys, said drive pulley being adjustable towards and away from the unbalanced pulley to vary the extent of oscillatory motion of the rocker arm.

7. In a device for separating materials, the combination et a screen, a frame mounted ad jacent. the screen, a rocker arm pivotally mounted on the iframe, means to oscillate the rocker arm, means carried by the screen adapted to be engaged by the rocker arm whereby said arm delivers vibratory impacts to the screen alternately in opposite directions transverse to the plane of its surface, and means in connection With the arm and trame to adjustably vary the force o the vibratory impacts of the arm.

8. In a device for separating materials, the combination of a screen, a rocker arm pivot ally mounted adjacent the screen, means to oscillate said arm, means carried by the screen adapted to be engaged by the rocker arm whereby said arm delivers vibratory impacts to the screen alternately in opposite direc tions transverse to the plane of its surface, said means being adjustable to vary the extent or' oscillatory movement of the rocker arm.

9. In a device for separating materials, the combination of a main trame, a screen yieldingly supported on said frame and yielding in a direction transverse to the plane of its surface, a second frame carried by said main trame, a rocker arm pivotally mounted central of its ends on said second frame, an unbalanced pulley carried by said rocker arm to oscillate it, a drive pulley carried by the second frame adjacent the unbalanced pul ley, a belt connection between said pulleys, the drive pulley being adjustable towards and away from the unbalanced pulley to vary the extent of oscillatory motion of. the rocker arm, adjustable cushioning means in connection with the arm and second frame to vary the force of oscillatory motion of the arm, impact members carried by the screen positioned and arranged to be impinged by the ends of the rocker arm to deliver vibratory impacts to the screen in opposite direction transverse to the plane of its surface, said impact members being adjustable to vary the extent of oscillatory motion of the rocker arm.

1G. In a devicer for separating materials the combination of a material supporting member,y means to vibrate said'supporting member, said vibrating means being ad`aptved to deliver vibratory impacts to said member in opposite directions transverseto the plane of its material supportingsurface, said l vibrating means being adjustable kto vary the force and frequency of' its impacts, and means to yieldingly support said material supporting member, said means being yielding in a direction substantiallyparallel to the direction of force of the vibratory impacts.

12. In a device for separating materials the combination of a material supporting member havingia material supporting surface, means to vibrate said member, said means being adapted to deliver vibratory impacts to said `member in a direction transverseto the plane of its material supporting surface and being adjustable to vary the force and frequency of its impacts, and means to yieldingly support said material supporting member, said means being yielding in a direction substantially parallel to the direction of force of the vibratory impacts.

13; In a device for Vseparating materials the combination of a material .supporting member having a material supporting 'surface, means to vibrate said member adapted to deliver vibratory impacts in a direction transverse to the plane of its material supporting surface, and means to yieldingly support said material supporting member, said means being yielding in a direction substantially parallel to the direction of force of the vibratory impacts and adjustable to vary the extent of its yielding movement.

14. In a device for separating materials the combination of a material supporting member having a material supporting lsurface, means to vibrate said member by delivering vibratory impacts thereto in opposite directions transverse to the planev of its material supporting surface, and being adjustable to vary the force and frequency of its impacts, and means to yieldingly support said material supporting member, said means being yielding in a direction substantially parallel to tlie direction of force of tlie vibra tory impacts and adjustable to vary the eX- tent of its yielding movement.

15. In a device'for separating materials the combination of a material supporting member having amaterial supporting sur-v face, means to vibrate said member by deliv-y Vering vibratory impacts thereto alternately H vibratory impacts and adjustable to vary the extent of its yielding movement. f

16. In a device for separating materials,

the combination of a material supporting memberliaving a material supporting siface, means to vibrate. said` member, said -means comprising a rocker arm adapted to deliver vibratory impacts to said member' in a'y direction transverse to the plane of its material supporting surface, means tooscillate said rocker arm, and means to yieldingly support said material supporting member,

said means being yielding in a directionsubstaiitially y parallel to the direction of force of the vibratory impacts and adjustable to vary the extent of its yielding movement.

17; In abdevice for separating materials,

the combination of a material supporting member rhaving a material supporting surface, means to vibrate said member, said means comprising a rocker arm adapted to deliver vibratory impacts to said member in a direction transverse to the plane of its material supporting surface, means to adjust :iioo

the force `and frequency of its impacts, means to oscillate said rocker arm', and means to yieldingly support said material supporting member, said means being yielding in a direction substantially parallel to the ,direction of force of the vibratory impacts and ad- Vjustableto vary the extent of its yielding movement.

18. In a device forseparating materials, no

the combination of a material supporting member having a material supporting surface, means tovibrate said member, said means comprising a rocker arm adapted to deliver vibratory impacts to said member in opposite directions transverseto the plane of its material supporting surface, and means to oscillate said rocker arm.

19. In a device for separating materials, the combination of a material supporting member having a material supporting surface, means to vibrate said member, said means comprising a rocker arm adapted to deliver vibratory impacts to said member in opposite directions transverse to the plane of its material supporting surface, means to adjust the force and frequency of its impacts, and means to oscillate lsaid rocker arm. i

20. In a device for separating materials the combination of a materiali supporting member having a material supporting surface, means to yielding-ly support said material supporting member, means to vibrate said member, said means comprising a rocker arm adapted to deliver vibratory impacts to said member in opposite directioit-,s transverse to the plane of its material supporting surface, means to adjust the force and frequency of its impacts, and means to oscillate said rocker arm.

21. In a device tor separating materials the combination of a material supporting member having a material supporting suri'ace, means to vibrate said member, said Ineans comprising a rocker arm adapted to deliver vibrator-y impacts to said member in opposite directions transverse to the plane of its material supporting surface, means to oscillate said rocker arm, and means to yieldingly support said material supporting member, said means being yielding in a direction substantially parallel tothe direction ot force of the vibratory impacts and adjustable to vary the extent of its yielding movement.

2:2. In a device tor separating materials the combination of a material supporting member having a material supporting surface, means to vibrate said member, said means comprising a rocker arm adapted to deliver vibratory impacts to said member in opposite directions transverse to the plane ot' its material supporting surface, means to adjust tbe force and 'frequency oi its impacts, means to oseillate said rocker arm, and means to yieldingly support said material supporting member, said means being yielding in a direction substantially parallel. to the direction of force of the vibratory impacts and adjustable to varytlie extent ot its yielding movement.

23. In a device for separating materials the combination of a material supporting member having a material supporting surface, means to vibrate said member, said means comprising a rocker arm, impact members in connection with said material supporting member, means to oscillate said rocker arm, said rocker arm being adapted to impinge against said impactmembers during its oscillatory movement to deliver vibratory impacts to the supporting member alternately in opposite directions transverse to the plane ot its material supporting surface.

24. In a device for separating materials the combination of a material supporting member having a material supporting surface, means for vibrating said member, said means comprising a rocker arm, means to oscillate said rocker arm, impact members carried by said material supporting member, the ends of said rocker arm being adapted to impinge against the impact members during its oscillatory movement to deliver vibratory impacts thereto simultaneously in opposite directions at its opposite ends and alternately in opposite directions at each end.

In a device i'or separating materials the combination of a material supporting member having a material supporting surface, means for vibrating said member, said means comprising a rocker arm, means to oscillate said rocker arm, impact members carried by said material-supporting member, the ends of said rocker arm being adapted to impinge against the impact members during its oscillatory movement to deliver vibratory impacts thereto simultaneously in opposite directions at its opposite ends and alternately in opposite directions at each end, the 'direction of :torce of said impacts being transverse to the plane of the material supporting surface.

2G. In a device for separating materials the at its opposite ends and alternately in opposite directions at each end, and means to vary the force and frequency of said impacts.

27. In a device for separating materials the combination of a material supporting member having a material supporting surface, means for yieldingly support-ing said member, means for vibrating said member, said means comprising a rocker arm, means to oscillate said rocker arm, impact members carried by said material supporting member, the ends of said rocker arm being adapted to impinge against the impact members during its oscillatory movement to deliver vibratory impacts thereto simultaneously in opposite directions at its opposite ends and alternately in opposite directions at each end, the direction ot' force of said impacts being transverse to the plane of the material supporting surface.

Q8. Ina device for separating materials the combination of a material supporting member having a material supporting surface, adjustable means for yieldingly supporting said member, means for vibrating said member, said means comprising a rocker arm, means to osciliate said rocker arm, impact members carried by said material supporting member, the ends of said rocker arm being adapted to impinge against the impact members during its oscillatory movement to de liver vibratory impacts thereto simultaneously in opposite directions at its opposite ends and alternately in opposite directions at each end, and means to vary the force and frequency of said impacts.

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29. In a device for separating materials the combination of a screen, adjustable means l for yieldingly supporting said screen, a rocker arm pivotally mounted central of its ends, an unbalanced pulley carried by said rocker arm to oscillate it, impact members carried by the screen positionedl andarranged to be impinged by the ends of the rocker arm to transmit vibratory impacts to the screen in opposite directions transverse to the `plane of its surface, said impactvmembers being adjustable to vary the extent of oscillatory movement of the rocker arm, and means in connection With said rocker arm and unbalanced pulley to' vary the force and frei quency of its vibratory impacts,

30. In a device for separating materials, Y the combination of a relatively immovable member having a material supporting surface, means to vibrate said surface comprising a relatively movable member arranged to deliver intermittent vibratory impacts thereto, alternately in opposite directions and transverse to the plane of said surface.

3l. In a device for separating materials, the combination of a suspended screen, and means to vibrate said screen by delivering vibratory impacts to thesuspended portion of the screen, alternately in opposite directions and transverse to the plane of its surface,

said impacts being delivered to effect the initial vibratory movement of the screen in the direction of the impacting force applied.

32. In a device for separating materials,

the combination of a relatively immovable member having a vibratory material supporting surface, means to vibrate said surface comprising a relatively movable member arranged to deliver intermittent vibratory impacts thereto, alternately in opposite directions and transverse to the plane of said surface, said impacts being delivered to eiiect the initial vibratory movement of the screen in the direction of the impacting force applied.

In Witness that I claim the foregoing I have hereunto subscribed my name this 2nd day of J une, 1922.

c JOHN F. .ISBELL CERTIFICATE OF CORRECTON.

Patent No. 1,744,899. Granted January 28, 1930, to

JOHN F. ISBELL. v

It is hereby certified that the above numbered patent was erroneousy issued to "Clementine Isheil, Administratrix of the estate of .ioim if". Isheil, deceased, assigner of one-half to Otto O. Beckwith, of Los Angeles, Csiiornia", whereas said patent shouid have been issued to "Claudis I. Siivey, sdministratrix of John F. Isheii, deceased, and Otto Q. Beckworth, of Los hgeies, California", said Eeckworth being assignee ot one-half interest in said invention, as shows by the records oi assignments in this office; and that the said Letters Patent shoiiid be read with this correction therein that the same may ecsiorm to the record of the case in the Patent Office.

Signed and sealed this 11th. day of March, A. D. 1930.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

